/* -*- mode: js2; js2-basic-offset: 4; indent-tabs-mode: nil -*- */

const GLib = imports.gi.GLib;
const Gio = imports.gi.Gio;
const Shell = imports.gi.Shell;
const Lang = imports.lang;
const Mainloop = imports.mainloop;
const Signals = imports.signals;
const St = imports.gi.St;

const DND = imports.ui.dnd;
const Main = imports.ui.main;
const Params = imports.misc.params;
const Search = imports.ui.search;
const Util = imports.misc.util;

/**
 * Represents a place object, which is most normally a bookmark entry,
 * a mount/volume, or a special place like the Home Folder, Computer, and Network.
 *
 * @name: String title
 * @iconFactory: A JavaScript callback which will create an icon texture given a size parameter
 * @launch: A JavaScript callback to launch the entry
 */
function PlaceInfo(id, name, iconFactory, launch) {
    this._init(id, name, iconFactory, launch);
}

PlaceInfo.prototype = {
    _init: function(id, name, iconFactory, launch) {
        this.id = id;
        this.name = name;
        this._lowerName = name.toLowerCase();
        this.iconFactory = iconFactory;
        this.launch = launch;
    },

    matchTerms: function(terms) {
        let mtype = Search.MatchType.NONE;
        for (let i = 0; i < terms.length; i++) {
            let term = terms[i];
            let idx = this._lowerName.indexOf(term);
            if (idx == 0) {
                mtype = Search.MatchType.PREFIX;
            } else if (idx > 0) {
                if (mtype == Search.MatchType.NONE)
                    mtype = Search.MatchType.SUBSTRING;
            } else {
                return Search.MatchType.NONE;
            }
        }
        return mtype;
    },

    isRemovable: function() {
        return false;
    }
};

// Helper function to translate launch parameters into a GAppLaunchContext
function _makeLaunchContext(params)
{
    params = Params.parse(params, { workspace: -1,
                                    timestamp: 0 });

    let launchContext = global.create_app_launch_context();
    if (params.workspace != -1)
        launchContext.set_desktop(params.workspace);
    if (params.timestamp != 0)
        launchContext.set_timestamp(params.timestamp);

    return launchContext;
}

function PlaceDeviceInfo(mount) {
    this._init(mount);
}

PlaceDeviceInfo.prototype = {
    __proto__: PlaceInfo.prototype,

    _init: function(mount) {
        this._mount = mount;
        this.name = mount.get_name();
        this._lowerName = this.name.toLowerCase();
        this.id = 'mount:' + mount.get_root().get_uri();
    },

    iconFactory: function(size) {
        let icon = this._mount.get_icon();
        return St.TextureCache.get_default().load_gicon(null, icon, size);
    },

    launch: function(params) {
        Gio.app_info_launch_default_for_uri(this._mount.get_root().get_uri(),
                                            _makeLaunchContext(params));
    },

    isRemovable: function() {
        return this._mount.can_unmount();
    },

    remove: function() {
        if (!this.isRemovable())
            return;

        if (this._mount.can_eject())
            this._mount.eject(0, null, Lang.bind(this, this._removeFinish));
        else
            this._mount.unmount(0, null, Lang.bind(this, this._removeFinish));
    },

    _removeFinish: function(o, res, data) {
        try {
            if (this._mount.can_eject())
                this._mount.eject_finish(res);
            else
                this._mount.unmount_finish(res);
        } catch (e) {
            let message = _("Failed to unmount '%s'").format(o.get_name());
            Main.overview.setMessage(message,
                                     Lang.bind(this, this.remove),
                                     _("Retry"));
        }
    }
};

function PlacesManager() {
    this._init();
}

PlacesManager.prototype = {
    _init: function() {
        this._defaultPlaces = [];
        this._mounts = [];
        this._bookmarks = [];

        let homeFile = Gio.file_new_for_path (GLib.get_home_dir());
        let homeUri = homeFile.get_uri();
        let homeLabel = Shell.util_get_label_for_uri (homeUri);
        let homeIcon = Shell.util_get_icon_for_uri (homeUri);
        this._home = new PlaceInfo('special:home', homeLabel,
            function(size) {
                return St.TextureCache.get_default().load_gicon(null, homeIcon, size);
            },
            function(params) {
                Gio.app_info_launch_default_for_uri(homeUri, _makeLaunchContext(params));
            });

        let desktopPath = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_DESKTOP);
        let desktopFile = Gio.file_new_for_path (desktopPath);
        let desktopUri = desktopFile.get_uri();
        let desktopLabel = Shell.util_get_label_for_uri (desktopUri);
        let desktopIcon = Shell.util_get_icon_for_uri (desktopUri);
        this._desktopMenu = new PlaceInfo('special:desktop', desktopLabel,
            function(size) {
                return St.TextureCache.get_default().load_gicon(null, desktopIcon, size);
            },
            function(params) {
                Gio.app_info_launch_default_for_uri(desktopUri, _makeLaunchContext(params));
            });

        this._connect = new PlaceInfo('special:connect', _("Connect to..."),
            function (size) {
                return new St.Icon({ icon_name: 'applications-internet',
                                     icon_type: St.IconType.FULLCOLOR,
                                     icon_size: size });
            },
            function (params) {
                // BUG: nautilus-connect-server doesn't have a desktop file, so we can't
                // launch it with the workspace from params. It's probably pretty rare
                // and odd to drag this place onto a workspace in any case

                Util.spawn(['nautilus-connect-server']);
            });

        this._defaultPlaces.push(this._home);
        this._defaultPlaces.push(this._desktopMenu);
        this._defaultPlaces.push(this._connect);

        /*
        * Show devices, code more or less ported from nautilus-places-sidebar.c
        */
        this._volumeMonitor = Gio.VolumeMonitor.get();
        this._volumeMonitor.connect('volume-added', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('volume-removed',Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('volume-changed', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('mount-added', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('mount-removed', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('mount-changed', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('drive-connected', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('drive-disconnected', Lang.bind(this, this._updateDevices));
        this._volumeMonitor.connect('drive-changed', Lang.bind(this, this._updateDevices));
        this._updateDevices();

        this._bookmarksPath = GLib.build_filenamev([GLib.get_home_dir(), '.gtk-bookmarks']);
        this._bookmarksFile = Gio.file_new_for_path(this._bookmarksPath);
        let monitor = this._bookmarksFile.monitor_file(Gio.FileMonitorFlags.NONE, null);
        this._bookmarkTimeoutId = 0;
        monitor.connect('changed', Lang.bind(this, function () {
            if (this._bookmarkTimeoutId > 0)
                return;
            /* Defensive event compression */
            this._bookmarkTimeoutId = Mainloop.timeout_add(100, Lang.bind(this, function () {
                this._bookmarkTimeoutId = 0;
                this._reloadBookmarks();
                return false;
            }));
        }));

        this._reloadBookmarks();
    },

    _updateDevices: function() {
        this._mounts = [];

        /* first go through all connected drives */
        let drives = this._volumeMonitor.get_connected_drives();
        for (let i = 0; i < drives.length; i++) {
            let volumes = drives[i].get_volumes();
            for(let j = 0; j < volumes.length; j++) {
                let mount = volumes[j].get_mount();
                if(mount != null) {
                    this._addMount(mount);
                }
            }
        }

        /* add all volumes that is not associated with a drive */
        let volumes = this._volumeMonitor.get_volumes();
        for(let i = 0; i < volumes.length; i++) {
            if(volumes[i].get_drive() != null)
                continue;

            let mount = volumes[i].get_mount();
            if(mount != null) {
                this._addMount(mount);
            }
        }

        /* add mounts that have no volume (/etc/mtab mounts, ftp, sftp,...) */
        let mounts = this._volumeMonitor.get_mounts();
        for(let i = 0; i < mounts.length; i++) {
            if(mounts[i].is_shadowed())
                continue;

            if(mounts[i].get_volume())
                continue;

            this._addMount(mounts[i]);
        }

        /* We emit two signals, one for a generic 'all places' update
         * and the other for one specific to mounts. We do this because
         * clients like PlaceDisplay may only care about places in general
         * being updated while clients like DashPlaceDisplay care which
         * specific type of place got updated.
         */
        this.emit('mounts-updated');
        this.emit('places-updated');

    },

    _reloadBookmarks: function() {

        this._bookmarks = [];

        if (!GLib.file_test(this._bookmarksPath, GLib.FileTest.EXISTS))
            return;

        let bookmarksContent = Shell.get_file_contents_utf8_sync(this._bookmarksPath);

        let bookmarks = bookmarksContent.split('\n');

        let bookmarksToLabel = {};
        let bookmarksOrder = [];
        for (let i = 0; i < bookmarks.length; i++) {
            let bookmarkLine = bookmarks[i];
            let components = bookmarkLine.split(' ');
            let bookmark = components[0];
            if (bookmark in bookmarksToLabel)
                continue;
            let label = null;
            if (components.length > 1)
                label = components.slice(1).join(' ');
            bookmarksToLabel[bookmark] = label;
            bookmarksOrder.push(bookmark);
        }

        for (let i = 0; i < bookmarksOrder.length; i++) {
            let bookmark = bookmarksOrder[i];
            let label = bookmarksToLabel[bookmark];
            let file = Gio.file_new_for_uri(bookmark);
            if (!file.query_exists(null))
                continue;
            if (label == null)
                label = Shell.util_get_label_for_uri(bookmark);
            if (label == null)
                continue;
            let icon = Shell.util_get_icon_for_uri(bookmark);

            let item = new PlaceInfo('bookmark:' + bookmark, label,
                function(size) {
                    return St.TextureCache.get_default().load_gicon(null, icon, size);
                },
                function(params) {
                    Gio.app_info_launch_default_for_uri(bookmark, _makeLaunchContext(params));
                });
            this._bookmarks.push(item);
        }

        /* See comment in _updateDevices for explanation why there are two signals. */
        this.emit('bookmarks-updated');
        this.emit('places-updated');
    },

    _addMount: function(mount) {
        let devItem = new PlaceDeviceInfo(mount);
        this._mounts.push(devItem);
    },

    getAllPlaces: function () {
        return this.getDefaultPlaces().concat(this.getBookmarks(), this.getMounts());
    },

    getDefaultPlaces: function () {
        return this._defaultPlaces;
    },

    getBookmarks: function () {
        return this._bookmarks;
    },

    getMounts: function () {
        return this._mounts;
    },

    _lookupIndexById: function(sourceArray, id) {
        for (let i = 0; i < sourceArray.length; i++) {
            let place = sourceArray[i];
            if (place.id == id)
                return i;
        }
        return -1;
    },

    lookupPlaceById: function(id) {
        let colonIdx = id.indexOf(':');
        let type = id.substring(0, colonIdx);
        let sourceArray = null;
        if (type == 'special')
            sourceArray = this._defaultPlaces;
        else if (type == 'mount')
            sourceArray = this._mounts;
        else if (type == 'bookmark')
            sourceArray = this._bookmarks;
        return sourceArray[this._lookupIndexById(sourceArray, id)];
    },

    _removeById: function(sourceArray, id) {
        sourceArray.splice(this._lookupIndexById(sourceArray, id), 1);
    }
};
Signals.addSignalMethods(PlacesManager.prototype);


function PlaceSearchProvider() {
    this._init();
}

PlaceSearchProvider.prototype = {
    __proto__: Search.SearchProvider.prototype,

    _init: function() {
        Search.SearchProvider.prototype._init.call(this, _("PLACES & DEVICES"));
    },

    getResultMeta: function(resultId) {
        let placeInfo = Main.placesManager.lookupPlaceById(resultId);
        if (!placeInfo)
            return null;
        return { 'id': resultId,
                 'name': placeInfo.name,
                 'createIcon': function(size) {
                                   return placeInfo.iconFactory(size);
                               }
               };
    },

    activateResult: function(id, params) {
        let placeInfo = Main.placesManager.lookupPlaceById(id);
        placeInfo.launch(params);
    },

    _compareResultMeta: function (idA, idB) {
        let infoA = Main.placesManager.lookupPlaceById(idA);
        let infoB = Main.placesManager.lookupPlaceById(idB);
        return infoA.name.localeCompare(infoB.name);
    },

    _searchPlaces: function(places, terms) {
        let multiplePrefixResults = [];
        let prefixResults = [];
        let multipleSubstringResults = [];
        let substringResults = [];

        terms = terms.map(String.toLowerCase);

        for (let i = 0; i < places.length; i++) {
            let place = places[i];
            let mtype = place.matchTerms(terms);
            if (mtype == Search.MatchType.MULTIPLE_PREFIX)
                multiplePrefixResults.push(place.id);
            else if (mtype == Search.MatchType.PREFIX)
                prefixResults.push(place.id);
            else if (mtype == Search.MatchType.MULTIPLE_SUBSTRING)
                multipleSubstringResults.push(place.id);
            else if (mtype == Search.MatchType.SUBSTRING)
                substringResults.push(place.id);
        }
        multiplePrefixResults.sort(this._compareResultMeta);
        prefixResults.sort(this._compareResultMeta);
        multipleSubstringResults.sort(this._compareResultMeta);
        substringResults.sort(this._compareResultMeta);
        return multiplePrefixResults.concat(prefixResults.concat(multipleSubstringResults.concat(substringResults)));
    },

    getInitialResultSet: function(terms) {
        let places = Main.placesManager.getAllPlaces();
        return this._searchPlaces(places, terms);
    },

    getSubsearchResultSet: function(previousResults, terms) {
        let places = previousResults.map(function (id) { return Main.placesManager.lookupPlaceById(id); });
        return this._searchPlaces(places, terms);
    }
};
